Construction Sites and CLP

A Construction Logistics Plan (CLP) is a document submitted with planning applications for major developments that sets out how construction vehicle movements will be managed safely during the construction phase. It is required by many local planning authorities as a planning condition or as part of the planning submission. CLPs are particularly important in urban areas where construction traffic has a significant impact on road safety and network efficiency.

A Construction Traffic Management Plan (CTMP) and a Construction Logistics Plan (CLP) serve similar purposes — managing construction vehicle movements safely — but have different origins and levels of detail. CTMPs are the traditional term used by highway authorities; CLPs are the more recent term developed by CLOCS (Construction Logistics and Community Safety) with a broader focus on vulnerable road user safety. In practice, the terms are sometimes used interchangeably, though CLOCS accreditation specifically relates to CLPs.

A CLP typically includes swept path analysis for key construction vehicle manoeuvres on the public highway and within the site. Common checks include: the largest concrete mixer or pump lorry accessing the site, abnormal load deliveries for large structural elements, HGV movements at the site access junction, and vehicle management within the site during peak construction phases.

CLOCS (Construction Logistics and Community Safety) is a programme that sets standards for the management of construction vehicles to reduce accidents involving vulnerable road users such as cyclists and pedestrians. CLOCS certification is required on many major construction projects, particularly in London. CLP Practitioner certification (with a CLOCS registration number) is the professional qualification for producing CLPs compliant with the CLOCS standard.

Construction CLP swept path analysis typically covers concrete mixer trucks, concrete pump lorries, ready-mix delivery vehicles, HGV delivery lorries, skip lorries, crane components and abnormal loads, tipper trucks, and piling rigs. The specific vehicles depend on the construction method and programme. The analysis focuses on the site access junction, any constrained sections of the approach route, and key manoeuvres within the site.

An abnormal load route survey assesses whether a proposed route is suitable for a vehicle or load that exceeds normal legal limits. Swept path analysis is used to check critical points along the route — tight junctions, bends, narrow sections, and railway or bridge crossings — to confirm that the abnormal load vehicle can navigate them safely. The survey typically includes swept path drawings for the critical locations submitted to the police and highway authority for approval.

A concrete mixer truck (ready-mix truck) is typically 8–10 metres long and has specific swept path requirements due to its rotating drum which can overhang the vehicle body on turns. The swept path analysis must account for the drum overhang, particularly on right-hand turns where the drum rotates outward. Standard concrete mixer trucks need generous turning radii, and site accesses that appear adequate for a rigid lorry may fail when a mixer truck's drum overhang is considered.

A concrete pump lorry is a specialist vehicle carrying a pumping unit and an extendable boom for placing concrete. In transport position (boom folded), the vehicle is typically 12–14 metres long. The swept path analysis checks that the vehicle can access the site and position near the pour location. In operational position (boom extended), the pump lorry occupies a much larger area; this operational envelope must be checked against adjacent roads, buildings, and overhead utilities.

A piling rig is a specialist construction machine used to drive or drill piles into the ground. Piling rigs are transported to site on low-loaders and assembled on site. The swept path analysis for a piling rig delivery focuses on the low-loader vehicle carrying the disassembled rig to site. Low-loaders carrying wide or long loads may require abnormal load permits and police escort, and the swept path analysis is part of the route approval process.

A crane sweep analysis is similar to swept path analysis but focuses on the operating envelope of a crane — the area swept by the crane's jib during slewing movements. While not strictly the same as vehicle swept path analysis, it uses the same spatial analysis principles. Crane sweep analyses are often required in urban environments where the crane's jib may overhang adjacent roads, buildings, or railway lines during operation.

A site access condition is a planning condition requiring the site access to be constructed to a specific standard before development can start. Swept path analysis demonstrates that the access design is adequate for the construction vehicles and that it will also be adequate for the end-use vehicles after construction. The swept path drawings form part of the technical submission required to discharge the access condition.

A CLOCS champion is an organisation — typically a developer, contractor, or local authority — that has formally committed to implementing the CLOCS standard for construction logistics management. CLOCS champions are listed on the CLOCS website and are required to ensure that their construction sites are managed in compliance with CLOCS requirements, including the preparation of CLPs.

A vulnerable road user (VRU) assessment identifies the risks to pedestrians, cyclists, and other non-motorised road users from construction vehicle movements. It includes an assessment of the likely routes of construction vehicles, the areas where VRUs may be at risk, and the measures to be put in place to reduce risk. Swept path analysis contributes to this assessment by identifying the areas adjacent to construction vehicle routes that are at risk of being encroached by the vehicle's swept path.

An HGV routing plan is a map showing the approved routes for heavy goods vehicles accessing the construction site. It typically directs vehicles to use main roads rather than minor residential roads, and may include turn restrictions to prevent left turns that would route vehicles past school gates or through narrow streets. The routing plan is based on swept path analysis of key junctions along the route to confirm that HGVs can navigate them safely.

A wheel wash is a device that cleans the wheels and underside of construction vehicles before they leave the site, reducing the deposition of mud and debris on public roads. The location of the wheel wash within the site must be designed to allow construction vehicles to access it and exit safely. Swept path analysis may be used to check that the vehicle can access the wheel wash and exit toward the site gate without conflict.

A banksman is a trained person who guides vehicle movements on a construction site, particularly during reversing manoeuvres. Swept path analysis identifies where reversing manoeuvres will occur and the areas that will be swept by the vehicle during those manoeuvres. This informs the deployment of banksmen at specific locations and the exclusion zones required around reversing vehicles.

A tipper truck is a heavy goods vehicle with a tipping body used for transporting and depositing aggregates, soil, and construction waste. Tipper trucks range from 7.5-tonne rigids to 32-tonne eight-wheelers. The swept path analysis for a tipper truck covers the same elements as for other rigid vehicles, with the addition of checking the tipping operation — particularly that the vehicle can position safely to tip without the raised body contacting overhead obstacles.

A skip lorry is a vehicle that delivers and collects skips (large waste containers) using a hydraulic hook-lift system. Skip lorries are typically 7–8 metres long. The swept path analysis must check both the driving swept path and the operational envelope of the skip lorry when placing or collecting a skip — the lorry must be able to position correctly relative to the skip location, and the operational area around the vehicle must be clear of obstacles.

A fuel tanker delivering diesel to site plant is typically a 6x2 rigid tanker of approximately 11–12 metres, or an articulated tanker of up to 16.5 metres. The swept path analysis checks that the tanker can access the site, reach the fuel storage area, and exit safely. The tanker must be able to position close enough to the storage tank to connect the delivery hose without the hose running across traffic routes.

A mobile crane is a self-propelled crane that travels on road on its own wheels. Mobile cranes range from small rough-terrain cranes of approximately 12 metres to large all-terrain cranes of 20 metres or more. The swept path analysis for a mobile crane covers its transport configuration (road travel), its approach to the lifting position, and its outrigger deployment pattern. Outriggers extend the operational footprint significantly beyond the vehicle's driving swept path.

A tower crane base is the foundation structure on which a tower crane is erected. The swept path analysis for the tower crane base focuses on delivering the crane components — tower sections, jib sections, and counterweights — to the site on flatbed lorries. These components may be long and wide enough to require abnormal load analysis. The route from the public road to the crane erection position within the site must accommodate these deliveries.

Modular construction involves manufacturing building elements off-site and transporting them to site for assembly. Modular units can be large — up to full room-sized modules on flatbed lorries. The swept path analysis for modular delivery covers the access route from the highway to the site and the positioning of the lorry on site for offloading. Modular units may require abnormal load status if they exceed standard vehicle dimensions.

A scaffold lorry delivers and collects scaffolding equipment. It is typically a rigid lorry of 7.5 to 12 tonnes. The swept path analysis checks access to the site and the operational area around the lorry during loading and unloading. Scaffold lorries unloading on the public highway are common in urban areas and the swept path must demonstrate that unloading operations do not create unacceptable conflicts with traffic and pedestrians.

A cherry picker (mobile elevated work platform or MEWP) is a vehicle-mounted or trailer-mounted platform for working at height. Vehicle-mounted MEWPs are driven to the work location and then the platform is raised. The swept path analysis covers both the driving approach to the work position and the operational footprint when the outriggers are deployed and the platform is raised. The operational footprint can be significantly wider than the vehicle's driving width.

A pumped concrete swept path analysis covers two vehicles: the concrete pump lorry positioning near the pour location and the ready-mix trucks delivering concrete to the pump. Both vehicles must access the pump position simultaneously — the pump lorry stationary and the mixer truck approaching. The swept path analysis demonstrates that both vehicles can manoeuvre safely in the same area simultaneously.

Major infrastructure projects such as Crossrail (Elizabeth line) developed specific guidance on CLP requirements that has influenced broader practice. The general principle established is that CLPs should include swept path analysis at all site access points, for all key delivery vehicle types, and at any constrained locations on the approved delivery route. This guidance is now reflected in CLOCS standards and many local authority CLP requirements.

A construction vehicle management scheme is the set of operational controls applied to the movement of construction vehicles on and off a site. It typically includes HGV routing, delivery booking systems, driver standards, and the use of banksmen. Swept path analysis informs the scheme by identifying where vehicle movements are most constrained and where the risk of accidents is highest.

A telehandler is a rough-terrain forklift with an extendable boom used on construction sites for materials handling. Forklifts and telehandlers are not typically road vehicles but may need to access public roads briefly. The swept path analysis for a telehandler covers its movement within the site and any point where it must access or cross a public road. Telehandlers have a shorter wheelbase than road vehicles and can turn very tightly.

The CLOCS Standard sets out requirements for the management of construction vehicle safety, including vehicle standards, driver training, journey management, and site management. For swept path, the CLOCS Standard requires that CLPs include evidence that construction vehicle access has been checked and that vehicle movements on the public highway are safe. This evidence is typically provided through swept path drawings at key locations.

Entering a tight construction site in an urban location with a cement mixer truck is one of the most challenging swept path scenarios. The analysis must show that the mixer truck can enter the site access, negotiate any turn at the access gate, reach the pour point, and exit without obstructing the public highway or conflicting with other site vehicles. The drum overhang on a right-hand turn is a common failure point that requires specific attention.

Temporary traffic management (TTM) is the arrangement of signs, barriers, and lane closures used to manage traffic safely around roadworks or construction activities. Swept path analysis can be used to check that construction vehicles can navigate through TTM arrangements safely, that the TTM layout provides adequate clearance for construction vehicles, and that the vehicle movements within the TTM zone do not create hazards.

A low-loader is a flatbed trailer with a low deck height, used for transporting heavy plant and machinery. Low-loaders are typically longer than standard lorries and have a very low swept path height, which requires checking against road humps, bridge soffits, and high kerbs. The swept path analysis checks the plan dimensions of the low-loader through junctions and bends, and the vertical clearances along the route.

Night-time delivery restrictions are planning conditions or local authority policies that limit the hours when HGV deliveries can be made in sensitive areas. While these restrictions do not affect the geometry of the swept path, they affect the operational context. During night-time deliveries when there is less traffic, larger vehicles may have more space to manoeuvre. The swept path analysis should be carried out for the most constrained conditions, which are typically during peak daytime traffic.

A walled site access is an access between two solid walls, piers, or gateposts. Swept path analysis is critical in this context because the walls are fixed obstacles that cannot be removed if the vehicle clips them. The swept path must demonstrate adequate clearance from both walls for all vehicles likely to use the access. Even a small error in the swept path analysis could result in vehicle damage or a vehicle becoming stuck.

A livestock transporter carries animals to farms, markets, and abattoirs. They are typically long rigid or articulated vehicles. The swept path analysis for livestock transporter access covers farm accesses, market accesses, and rural lanes that must accommodate these vehicles. Livestock transporters often use narrow rural roads with tight junctions that were not designed for modern large vehicles.